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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jetbrains.python.codeInsight.intentions;

import com.intellij.codeInsight.intention.impl.BaseIntentionAction;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.IncorrectOperationException;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.PyTokenTypes;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NotNull;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by IntelliJ IDEA.
 * Author: Alexey.Ivanov
 * Date:   12.03.2010
 * Time:   17:58:56
 */
public class PyNegateComparisonIntention extends BaseIntentionAction {
  private static final Map comparisonStrings = new HashMap(7);
  private static final Map invertedComparasions = new HashMap(7);

  static {
    comparisonStrings.put(PyTokenTypes.LT, "<");
    comparisonStrings.put(PyTokenTypes.GT, ">");
    comparisonStrings.put(PyTokenTypes.EQEQ, "==");
    comparisonStrings.put(PyTokenTypes.LE, "<=");
    comparisonStrings.put(PyTokenTypes.GE, ">=");
    comparisonStrings.put(PyTokenTypes.NE, "!=");
    comparisonStrings.put(PyTokenTypes.NE_OLD, "<>");

    invertedComparasions.put(PyTokenTypes.LT, PyTokenTypes.GE);
    invertedComparasions.put(PyTokenTypes.GT, PyTokenTypes.LE);
    invertedComparasions.put(PyTokenTypes.EQEQ, PyTokenTypes.NE);
    invertedComparasions.put(PyTokenTypes.LE, PyTokenTypes.GT);
    invertedComparasions.put(PyTokenTypes.GE, PyTokenTypes.LT);
    invertedComparasions.put(PyTokenTypes.NE, PyTokenTypes.EQEQ);
    invertedComparasions.put(PyTokenTypes.NE_OLD, PyTokenTypes.EQEQ);
  }

  @NotNull
  public String getFamilyName() {
    return PyBundle.message("INTN.negate.comparison");
  }

  public boolean isAvailable(@NotNull Project project, Editor editor, PsiFile file) {
    if (!(file instanceof PyFile)) {
      return false;
    }

    PsiElement element = file.findElementAt(editor.getCaretModel().getOffset());
    PyBinaryExpression binaryExpression = PsiTreeUtil.getParentOfType(element, PyBinaryExpression.class, false);
    while (binaryExpression != null) {
      PyElementType operator = binaryExpression.getOperator();
      if (comparisonStrings.containsKey(operator)) {
        setText(PyBundle.message("INTN.negate.$0.to.$1", comparisonStrings.get(operator),
                                 comparisonStrings.get(invertedComparasions.get(operator))));
        return true;
      }
      binaryExpression = PsiTreeUtil.getParentOfType(binaryExpression, PyBinaryExpression.class);
    }
    return false;
  }

  public void invoke(@NotNull Project project, Editor editor, PsiFile file) throws IncorrectOperationException {

    PsiElement element = file.findElementAt(editor.getCaretModel().getOffset());
    PyBinaryExpression binaryExpression = PsiTreeUtil.getParentOfType(element, PyBinaryExpression.class, false);
    while (binaryExpression != null) {
      PyElementType operator = binaryExpression.getOperator();
      if (comparisonStrings.containsKey(operator)) {
        PsiElement parent = binaryExpression.getParent();
        while (parent instanceof PyParenthesizedExpression) {
          parent = parent.getParent();
        }

        final PyElementType invertedOperator = invertedComparasions.get(binaryExpression.getOperator());
        PyElementGenerator elementGenerator = PyElementGenerator.getInstance(project);
        final PyBinaryExpression newElement = elementGenerator
          .createBinaryExpression(comparisonStrings.get(invertedOperator), binaryExpression.getLeftExpression(),
                                  binaryExpression.getRightExpression());

        if (parent instanceof PyPrefixExpression && ((PyPrefixExpression)parent).getOperator() == PyTokenTypes.NOT_KEYWORD) {
          parent.replace(newElement);
        }
        else {
          binaryExpression.replace(elementGenerator.createExpressionFromText("not " + newElement.getText()));
        }
        return;
      }
      binaryExpression = PsiTreeUtil.getParentOfType(binaryExpression, PyBinaryExpression.class);
    }
  }
}